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Diagnosing psychotic disorders: validity, reliability and applications of the Diagnostic Interview for Psychosis (DIP). Italian version

Published online by Cambridge University Press:  11 April 2011

Alberto Rossi ,
Vera Morgan ,
Francesco Amaddeo ,
Marco Sandri ,
Laura Grigoletti ,
Francesca Maggioni ,
Adele Ferro ,
Elena Rigon ,
Valeria Donisi  and
Valeria Vailati Venturi
...Show all authors
Alberto Rossi*
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Vera Morgan
Affiliation:
School of Psychiatry and Clinical Neurosciences. The University of Western Australia, Perth (Australia)
Francesco Amaddeo
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Marco Sandri
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Laura Grigoletti
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Francesca Maggioni
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Adele Ferro
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Elena Rigon
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Valeria Donisi
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Valeria Vailati Venturi
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Fabrizio Goria
Affiliation:
Centre for Clinical Research in Neuropsychiatry & School of Psychiatry & Clinical Neurosciences, The University of Western Australia. Perth (Australia)
Ingunn Skre
Affiliation:
Department of Psychology, University of Tromsø. Tromsø, Norway
Michele Tansella
Affiliation:
Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, University of Verona, Verona (Italy)
Assen Jablensky
Affiliation:
Centre for Clinical Research in Neuropsychiatry & School of Psychiatry & Clinical Neurosciences, The University of Western Australia. Perth (Australia)
*
Address for correspondence: Dr. A. Rossi, Department of Medicine and Public Health, Section of Psychiatry and Clinical Psychology, Ospedale Policlinico, Piazzale L.A. Scuro 10, 37134 Verona (Italy). Fax: +39-045-8027498 Email: alberto.rossi@univr.it
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Extract

Aims – The Diagnostic Interview for Psychoses (DIP) is a comprehensive interview schedule for psychotic disorders, linked to the OPCRIT diagnostic algorithm, bridging the gap between fully structured, lay-administered schedules and semistructured, psychiatrist-administered interviews. Here we describe the validity, reliability and applications of the Italian version of the DIP. Methods – The interview was translated into Italian and its content validity tested by back translation. Sixty patients, drawn from among those who contacted the South-Verona Community Mental Health Service, were included in the study. Each patient was first assessed independently by two raters, one of whom conducted the interview, while the other assumed the role of observer. Subsequently (median: 89 days), 44 of these patients were re-interviewed by a third rater, who made an independent assessment. Diagnostic validity was assessed in 18 cases, interviewed with the DIP and using the SCAN as ‘gold standard. Results – The mean duration of the interview was 37 minutes for the inter-rater interviews and 39 minutes for the retest interviews. Good to excellent inter-rater reliability was demonstrated for both ICD-10 and DSM-IV diagnoses, while in the test-retest reliability pairwise agreement was high for half of the items. Diagnostic validity was good, with twelve out of the 18 DIP-OPCRIT diagnoses (67%) matching the SCAN diagnosis. Conclusions – Overall, the results support the reliability and validity of the Italian translation of the DIP. The Italian version will be useful both in routine practice to establish standard reference diagnoses of psychosis and in the research field, where it can be used by academic researchers in clinical trials and epidemiological studies.

Keywords

psychiatric diagnostic structured interviewspsychotic disordersreliability studyCohen's Kappa
Type
Original Articles
Information
Epidemiology and Psychiatric Sciences , Volume 19 , Issue 1 , March 2010 , pp. 33 - 43
Copyright
Copyright © Cambridge University Press 2010

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